TW200830712A - Power-on-reset circuit and method therefor - Google Patents

Power-on-reset circuit and method therefor Download PDF

Info

Publication number
TW200830712A
TW200830712A TW096128912A TW96128912A TW200830712A TW 200830712 A TW200830712 A TW 200830712A TW 096128912 A TW096128912 A TW 096128912A TW 96128912 A TW96128912 A TW 96128912A TW 200830712 A TW200830712 A TW 200830712A
Authority
TW
Taiwan
Prior art keywords
power
voltage
reset
circuit
supply voltage
Prior art date
Application number
TW096128912A
Other languages
Chinese (zh)
Inventor
Chung-Ming Huang
Chih-Haur Huang
Original Assignee
Himax Tech Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Himax Tech Ltd filed Critical Himax Tech Ltd
Publication of TW200830712A publication Critical patent/TW200830712A/en

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/22—Modifications for ensuring a predetermined initial state when the supply voltage has been applied
    • H03K17/223—Modifications for ensuring a predetermined initial state when the supply voltage has been applied in field-effect transistor switches
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/14—Modifications for compensating variations of physical values, e.g. of temperature
    • H03K17/145—Modifications for compensating variations of physical values, e.g. of temperature in field-effect transistor switches
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/30—Modifications for providing a predetermined threshold before switching
    • H03K17/302—Modifications for providing a predetermined threshold before switching in field-effect transistor switches

Landscapes

  • Electronic Switches (AREA)

Abstract

A power-on-reset circuit used to detect a first supply voltage for resetting a semiconductor device within an electric system is provided. The power-on-reset circuit is equipped with the first supply voltage to power the semiconductor device and a second supply voltage generated prior to the first supply voltage. The power-on-reset circuit includes a voltage divider, a bandgap reference circuit and a comparator. The voltage divider is powered by the first supply voltage to generate a proportional input voltage. The bandgap reference circuit is powered by the second supply voltage to generate a constant reference voltage. The comparator compares the proportional input voltage with the constant reference voltage, so as to generate a power-on-reset signal when the proportional input voltage exceeds the constant reference voltage. Therefore, when the first supply voltage is sufficiently large, the power-on-reset circuit can correctly reset the electric system.

Description

200830712TW3mpA ’ 九、發明說明： 【發明所屬之技術領域】 本發明是有關於一種電源啟動重置電路，且特別是有 關於一種適用於低電壓操作之電源啟動重置電路。 【先前技術】 第1圖繪示傳統電源啟動重置（p0wer-on_reset)電 路之方塊圖。電源啟動重置電路1〇〇偵測一電源電壓Vp， • 依據電源電壓Vp5重置在電子系統中之一半導體裝置。電 子系統例如為一液晶顯示器，半導體裝置例如是一時序控 制器。當電源電壓Vp充分高時，電源啟動重置電路1〇〇 輸出一南位準之電源啟動重置訊號v〇。否則，電源啟動重 置電路100輸出低位準之電源啟動重置訊號v〇，以使半導 體裝置保持非致能。 第1圖之電源啟動重置電路100包括一能隙參考電路 110、分壓電路120與一比較器13〇。能隙參考電路11〇與 分壓電路120均接收相同的電源電壓Vp當作電源，並分 別據以輪出一固定參考電壓Vr與和電源電壓外成比例之 时輸入電壓Vi (或比例输入電壓至比較器13〇。比較 $ 130比較固定參考電壓七與比例輸入電壓^卜當比例 輸人電壓Vi超過ϋ定參考電壓〜時，比較器始輸出高位 準之電源啟動重置訊號V〇。 然而，除非電源電壓Vp充分高，否則固定參考電壓 Vp可能無法及時提供至能隙參考電路ιι〇。如此，比較器 2008307 12tw3ihpa 130可能錯誤地比較比例輸入電BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power-on reset circuit, and more particularly to a power-on reset circuit suitable for low-voltage operation. [Prior Art] Fig. 1 is a block diagram showing a conventional power-on reset (p0wer-on_reset) circuit. The power-on reset circuit 1 detects a power supply voltage Vp, and resets a semiconductor device in the electronic system according to the power supply voltage Vp5. The electrical subsystem is, for example, a liquid crystal display, and the semiconductor device is, for example, a timing controller. When the power supply voltage Vp is sufficiently high, the power-on reset circuit 1 outputs a south-level power-on reset signal v〇. Otherwise, the power-on reset circuit 100 outputs a low-level power-on reset signal v〇 to keep the semiconductor device disabled. The power-on reset circuit 100 of Fig. 1 includes a bandgap reference circuit 110, a voltage dividing circuit 120 and a comparator 13A. The gap reference circuit 11A and the voltage dividing circuit 120 both receive the same power supply voltage Vp as a power source, and respectively according to a fixed reference voltage Vr and an input voltage Vi (or proportional input) proportional to the power supply voltage. The voltage is compared to the comparator 13. The comparison of $130 compares the fixed reference voltage with the proportional input voltage. When the proportional input voltage Vi exceeds the predetermined reference voltage, the comparator starts to output a high level of power to initiate the reset signal V〇. However, unless the power supply voltage Vp is sufficiently high, the fixed reference voltage Vp may not be provided to the bandgap reference circuit in time. Thus, the comparator 2008307 12tw3ihpa 130 may incorrectly compare the proportional input power.

Vr-因此，傳統電源啟動重置 /、禾承扪 中。 ，路热法應用於低電壓操作 【發明内容】 有鑑於此，本發明的目的、 置電路，較在铸體裝置提供—種電源啟動重 時，仍可正確地重置一電子㈣壓尚未足約高 k供弟二電源電壓與第一電源 伙厅 ♦ M l A〜 兔堡來對能電源啟動重詈 電路的隙參考電路與分壓電路供命—灸去+ 第-電源電壓產生時，及時就^ ’固疋參考“可以於 ^ ^ 疵緒。因此比較器得以正確地Vr- Therefore, the traditional power supply starts resetting /, Wo Cheng. The road heat method is applied to low voltage operation. SUMMARY OF THE INVENTION In view of the above, the object and the circuit of the present invention can still correctly reset an electron (four) voltage when the power source starts to provide a power source. About high k for the second power supply voltage and the first power supply ♦ M l A ~ Rabbit Fort to the power supply start the reset circuit of the gap reference circuit and the voltage divider circuit for life - moxibustion + the first - supply voltage generation In time, ^ 'solid reference' can be used in ^ ^ 。 。. Therefore the comparator is correctly

Mr刀壓電路產生的比例輸人電麗與蚊參考電壓。 根據本毛明的目的’提出—種電源敌動重置電路，用 於m、統之-半導體裝置。電子线純供以一第一 包源電壓與-第二電源電壓。第—電源電壓係為半導體裝 置之電源電壓。第二電源電壓係較第一電源電壓早產生。 電源啟動4置電路包括—分壓電路、—能隙參考電路與一 比較器。分壓電路係被供以第一電源電壓，以產生一/比例 輪入電壓。能隙參考電路係被供以第二電源電壓，以產生 一固定參考電壓。比較器用以比較比例輸入電壓與固定參 考電壓，以於比例輸入電壓超越固定參考電壓時，產生一 電源啟動重置訊號。 根據本發明的目的，提出一種電源啟動重置訊號之產 生方法，用以產生一電源啟動重置訊號，以重置一電子系The ratio produced by the Mr. knife circuit is input to the electric and mosquito reference voltage. According to the purpose of the present invention, a power supply enemy reset circuit is proposed for use in a m-system-semiconductor device. The electron line is supplied with a first package source voltage and a - second supply voltage. The first - supply voltage is the supply voltage of the semiconductor device. The second supply voltage is generated earlier than the first supply voltage. The power-on 4 circuit includes a voltage divider circuit, a bandgap reference circuit, and a comparator. The voltage divider circuit is supplied with a first supply voltage to generate a / proportional turn-in voltage. The bandgap reference circuit is supplied with a second supply voltage to generate a fixed reference voltage. The comparator compares the proportional input voltage with the fixed reference voltage to generate a power-on reset signal when the proportional input voltage exceeds a fixed reference voltage. According to an object of the present invention, a method for generating a power-on reset signal is provided for generating a power-on reset signal to reset an electronic system

200830712W3111PA • 統之一半導體裝置。電子系統係被供以一第一電源電壓與 一第二電源電壓。第一電源電壓係為半導體裝置之電源電 壓。第二電源電壓係較第一電源電壓早產生。此方法包括： 首先，依據第二電源電壓產生一固定參考電壓。接著，依 據第一電源電壓產生一比例輸入電壓。之後，比較比例輸 入電壓與固定參考電壓，以於比例輸入電壓超越固定參考 電壓時，產生電源啟動重置訊號。 根據本發明的目的，提出一種電源啟動重置電路，包 • 括一分壓電路、一能隙參考電路與一比較器。分壓電路係 被供以一第一電源電壓，以產生一比例輸入電壓。能隙參 考電路係被供以一第二電源電壓，以產生一固定參考電 壓。其中在第一電源電壓開始產生之前，第二電源電壓已 經完成準備。比較器係比較比例輸入電壓與固定參考電 壓。當比例輸入電壓超越固定參考電壓時，產生一電源啟 動重置訊號。 為讓本發明之上述目的、特徵、和優點能更明顯易 ⑩ 懂，下文特舉一較佳實施例，並配合所附圖式，作詳細說 明如下： 【實施方式】 - · - . 本發明實施例之電源啟動重置電路，用以偵測一第一 電源電壓，使得即使當第一電源電壓尚未足夠高時，仍可 输出一電源啟動重置訊號，以重置一半導體裝置。在本發 明實施例之電源啟動重置電路中，分別對一分壓電路與一 200830712·· — 能隙參考電路供以第一電源電壓與一第二電源電壓。其 中，第二電源電壓係較第一電源電壓早產生。如此一來， 當第一電源電壓產生時，固定參考電壓即已正確就緒。比 較器即得以比較比例輸入電壓與固定參考電壓，以決定第 一電源電壓是否實質上夠高。當電源啟動重置電路偵測到 第一電源電壓足夠高時，比較器即輸出電源啟動重置訊 號，以重置電子系統之半導體裝置。 第2圖繪示本發明實施例之電源啟動重置電路之方 φ 塊圖。在本發明實施例中，第2圖之電源啟動重置電路200 係用以重置一電子系統的半導體裝置。電子系統例如是液 晶顯示器，半導體裝置例如是時序控制器。電子系統係被 供以一第一電源電壓VI與一第二電源電壓V2。第一電源 電壓VI係對半導體裝置供電，第二電源電壓V2係較第一 電源電壓VI早產生。電源啟動重置電路200接收並偵測 第一電源電壓VI，並接收第二電源電壓V2。 電源啟動重置電路200包括一能隙參考電路210、一 • 分壓電路220與一比較器230。分壓電路220與能隙參考 電路210分別被供以第一電源電壓VI與第二電源電壓 V2。第二電源電壓V2係較第一電源電壓VI先產生，使得 能隙參考電路210得以第一電源電壓¥1產生時，及時提 供一固定參考電壓Vref。亦即，當分壓電路220輸出比例 輸入電壓Vt時，參考電壓Vref已經就緒。 比較器230比較比例輸入電壓Vt與固定參考電壓 Vref，以偵測第一電源電壓VI是否實質上夠高。當第一200830712W3111PA • One of the semiconductor devices. The electronic system is supplied with a first supply voltage and a second supply voltage. The first supply voltage is the power supply voltage of the semiconductor device. The second supply voltage is generated earlier than the first supply voltage. The method includes: First, generating a fixed reference voltage according to the second power voltage. A proportional input voltage is then generated based on the first supply voltage. Thereafter, the proportional input voltage is compared to a fixed reference voltage to generate a power-on reset signal when the proportional input voltage exceeds a fixed reference voltage. In accordance with the purpose of the present invention, a power-on reset circuit is provided that includes a voltage divider circuit, a bandgap reference circuit, and a comparator. The voltage dividing circuit is supplied with a first power supply voltage to generate a proportional input voltage. The energy gap reference circuit is supplied with a second supply voltage to generate a fixed reference voltage. Wherein the second supply voltage is ready before the first supply voltage begins to be generated. The comparator compares the proportional input voltage to a fixed reference voltage. When the proportional input voltage exceeds the fixed reference voltage, a power-on reset signal is generated. The above described objects, features, and advantages of the present invention will become more apparent and understood from the following description. The power-on reset circuit of the embodiment is configured to detect a first power voltage so that even when the first power voltage is not sufficiently high, a power-on reset signal can be output to reset a semiconductor device. In the power-on reset circuit of the embodiment of the present invention, a voltage divider circuit and a power supply reference circuit are respectively supplied with a first power supply voltage and a second power supply voltage. The second supply voltage is generated earlier than the first supply voltage. As a result, when the first power supply voltage is generated, the fixed reference voltage is properly ready. The comparator compares the proportional input voltage to a fixed reference voltage to determine if the first supply voltage is substantially high enough. When the power-on reset circuit detects that the first supply voltage is sufficiently high, the comparator output power initiates a reset signal to reset the semiconductor device of the electronic system. FIG. 2 is a block diagram of a power-on reset circuit of the embodiment of the present invention. In the embodiment of the present invention, the power-on reset circuit 200 of FIG. 2 is used to reset a semiconductor device of an electronic system. The electronic system is, for example, a liquid crystal display, and the semiconductor device is, for example, a timing controller. The electronic system is supplied with a first supply voltage VI and a second supply voltage V2. The first power supply voltage VI supplies power to the semiconductor device, and the second power supply voltage V2 is generated earlier than the first power supply voltage VI. The power-on reset circuit 200 receives and detects the first power voltage VI and receives the second power voltage V2. The power-on reset circuit 200 includes a bandgap reference circuit 210, a voltage dividing circuit 220, and a comparator 230. The voltage dividing circuit 220 and the band gap reference circuit 210 are supplied with a first power source voltage VI and a second power source voltage V2, respectively. The second power supply voltage V2 is generated first than the first power supply voltage VI, so that when the energy gap reference circuit 210 is generated by the first power supply voltage ¥1, a fixed reference voltage Vref is provided in time. That is, when the voltage dividing circuit 220 outputs the proportional input voltage Vt, the reference voltage Vref is already ready. The comparator 230 compares the proportional input voltage Vt with the fixed reference voltage Vref to detect whether the first power supply voltage VI is substantially high enough. When first

200830712rw311iPA ； 電源電壓VI實質上夠高，亦即，比例輸入電壓vt超越固 定參考電壓Vref時，比較器230即輸出電源啟動重置訊 號Vo來重置電子系統中的半導體裝置。 第3圖繪示本發明實施例中，第一電源電壓、第二電 源電壓、固定參考電壓、比例輸入電壓與電源啟動重置訊 號之時序圖之一例。茲以第3圖進一步說明電源啟動重置 電路200的動作。在時間T0時，電子系統的半導體裝置 係為非致能，且所有上述電壓係為初始狀態，在本發明實 • 施例中係為0伏特。於時間T1，當半導體裝置要被重置時， 第二電源電壓V2開始上升，能隙參考電路210得以據以 準備固定參考電壓Vref。 於時間T3,固定參考電壓Vref就緒之後，於時間T4, 第一電源電壓V1始開始上升，而分壓電路22 0始據以產 生比例輸入電壓V t。 因此，固定參考電壓Vr可以在第一電源電壓VI產、生 之時，及時就緒，即可比較固定參考電壓Vr與比例输入 • 電壓Vt。於時間T5前，當第一電源電壓VI尚未足夠大時， 亦即，比較器230比較並判定比例輸入電壓Yt小於固定 參考電壓Vref，一低位準的電源啟動重置訊號¥〇係被輸 出，以使半導體裝置保持非致能。於時間T5，當第一電源 電壓VI繼續上升，且比例輸出電壓vt超過固定參考電壓 Vref，比較器230及輸出一高位準的電源啟動重置訊號Vo 來重置半導體裝置。 在本發明實施例的電源啟動重置電路中，能隙參考電200830712rw311iPA ; The power supply voltage VI is substantially high enough, that is, when the proportional input voltage vt exceeds the fixed reference voltage Vref, the comparator 230 outputs a power-on reset signal Vo to reset the semiconductor device in the electronic system. Figure 3 is a diagram showing an example of a timing chart of the first power supply voltage, the second power supply voltage, the fixed reference voltage, the proportional input voltage, and the power-on reset signal in the embodiment of the present invention. The operation of the power-on reset circuit 200 will be further described with reference to FIG. At time T0, the semiconductor device of the electronic system is disabled, and all of the above voltages are in an initial state, which is 0 volts in the practice of the present invention. At time T1, when the semiconductor device is to be reset, the second power supply voltage V2 starts to rise, and the bandgap reference circuit 210 is thereby prepared to prepare the fixed reference voltage Vref. After the fixed reference voltage Vref is ready at time T3, at time T4, the first supply voltage V1 begins to rise, and the voltage divider circuit 22 starts to generate the proportional input voltage Vt. Therefore, the fixed reference voltage Vr can be prepared in time when the first power supply voltage VI is generated and generated, and the fixed reference voltage Vr and the proportional input voltage Vt can be compared. Before time T5, when the first power supply voltage VI is not sufficiently large, that is, the comparator 230 compares and determines that the proportional input voltage Yt is smaller than the fixed reference voltage Vref, and a low level power supply start reset signal is output. In order to keep the semiconductor device non-enabled. At time T5, when the first power supply voltage VI continues to rise and the proportional output voltage vt exceeds the fixed reference voltage Vref, the comparator 230 and the output high-level power supply activate the reset signal Vo to reset the semiconductor device. In the power-on reset circuit of the embodiment of the invention, the energy gap reference power

200830712TW3111PA * 路與分壓電路係分別由第二電源電壓與第一電源電壓供 電，其中第二電源電壓係較第一電源電壓先產生。如此， 當第一電源電壓產生時，固定參考電壓已經就緒，使得比 例輸入電壓與固定參考電壓可以正確地被比較。因此，即 使電源啟動重置電路用以重置低電壓操作的電子系統的 半導體裝置，能隙參考電路仍可正確地產生電源啟動重置 訊號。 此外，為確保比較器230及時反應，比較器230係較 H 佳地由第二電源電壓供電。另外，為使固定參考電壓及早 就緒，當半導體裝置被重置時，第二電源電壓可以大於第 一電源電壓。 .第4圖繪示本發明實施例之電源啟動重置訊號產生 方法，用於電源啟動重置電路2 0 0，用以重置一電子系統 中的半導體裝置。首先，步驟410中，能隙參考電路依據 較第一電源電壓先產生的第二電源電壓，產生固定參考電 壓。接著，在步驟420中，分壓電路依據第一電源電壓產 Φ 生比例輸入電壓。然後，步驟430中，比較器比較固定參 考電壓與比例輸入電壓，以於比例輸入電壓超越固定參考 電壓時，輸出電源啟動重置訊號，來重置電子系統之半導 體裝置。 綜上所述，雖然本發明已以一較佳實施例揭露如上， 然其並非用以限定本發明。本發明所屬技術領域中具有通 常知識者，在不脫離本發明之精神和範圍内，當可作各種 之更動與潤飾。因此，本發明之保護範圍當視後附之申請 專利範圍所界定者為準。200830712TW3111PA * The circuit and voltage dividing circuit are respectively powered by the second power voltage and the first power voltage, wherein the second power voltage is generated first than the first power voltage. Thus, when the first supply voltage is generated, the fixed reference voltage is ready so that the ratio input voltage and the fixed reference voltage can be correctly compared. Therefore, even if the power-on reset circuit is used to reset the semiconductor device of the low-voltage operating electronic system, the bandgap reference circuit can correctly generate the power-on reset signal. In addition, to ensure that the comparator 230 reacts in time, the comparator 230 is preferably powered by the second supply voltage. Additionally, to make the fixed reference voltage ready early, the second supply voltage can be greater than the first supply voltage when the semiconductor device is reset. Figure 4 is a diagram showing a method for generating a power-on reset signal according to an embodiment of the present invention for a power-on reset circuit 200 for resetting a semiconductor device in an electronic system. First, in step 410, the bandgap reference circuit generates a fixed reference voltage based on a second power supply voltage generated earlier than the first power supply voltage. Next, in step 420, the voltage dividing circuit generates a proportional input voltage according to the first power voltage. Then, in step 430, the comparator compares the fixed reference voltage with the proportional input voltage to reset the electronic system's semiconductor device when the proportional input voltage exceeds the fixed reference voltage and the output power source initiates a reset signal. In view of the above, the present invention has been disclosed in a preferred embodiment, and is not intended to limit the present invention. It will be apparent to those skilled in the art that various changes and modifications can be made without departing from the spirit and scope of the invention. Therefore, the scope of the invention is defined by the scope of the appended claims.

200830712rW3111PA ^ 【圖式簡單說明】 第1圖繪示傳統電源啟動重置電路之方塊圖。 第2圖繪示本發明實施例之電源啟動重置電路之方 塊圖。 第3圖繪示本發明實施例之第一電源電壓、第二電源 電壓、固定參考電壓、比例輸入電壓與電源啟動重置訊號 之時序圖。 第4圖繪示本發明實施例之電源啟動重置訊號產生 Q 方法。 【主要元件符號說明】 110、210 :能隙參考電路 120、220 :分壓電路 130、230 :比較器 12200830712rW3111PA ^ [Simple description of the diagram] Figure 1 shows a block diagram of a conventional power-on reset circuit. FIG. 2 is a block diagram showing a power-on reset circuit according to an embodiment of the present invention. FIG. 3 is a timing diagram of the first power supply voltage, the second power supply voltage, the fixed reference voltage, the proportional input voltage, and the power-on reset signal according to the embodiment of the present invention. FIG. 4 is a diagram showing a Q method for generating a power-on reset signal according to an embodiment of the present invention. [Description of main component symbols] 110, 210: bandgap reference circuit 120, 220: voltage dividing circuit 130, 230: comparator 12

Claims (1)

200830712 TW3111PA ^ 十、申請專利範圍： 1. 一種電源啟動重置電路，用於一電子系統之一半 導體裝置，該電子系統係被供以一第一電源電壓與一第二 電源電壓，該第一電源電壓係為該半導體裝置之電源電 壓，該第二電源電壓係較該第一電源電壓早產生，包括： 一分壓電路，係被供以該第一電源電壓，以產生一比 例輸入電壓； 一能隙蒼考電路’係被供以該第二電源電壓’以產生 • 一固定參考電壓； 一比較器，用以比較該比例輸入電壓與該固定參考電 壓，以於該比例輸入電壓超越該固定參考電壓時，產生一 電源啟動重置訊號。 2. 如申請專利範圍第1項所述之電源啟動重置電 路，其中，當該比較輸入電壓超越該固定參考電壓時，該 比較器產生高位準之該電源啟動重置訊號。 3. 如申請專利範圍第1項所述之電源啟動重置電 * 路，其中，當該比較輸入電壓未超越該固定參考電壓時， 該比較器產生低位準之該電源啟動重置訊號。 4. 如申請專利範圍第1項所述之電源啟動重置電 路，其中，該比較器係被供以該第二電源電壓。 • · · , · ' · .. 5. 如申請專利範圍第1項所述之電源啟動重置電 路，其中，當該第二電源電壓係高於該第一電源電壓時， 該半導體裝置被重置。 13 200830712 TW3111PA 6. 如申請專利範圍第1項所述之電源啟動重置電 路，其中，該半導體裝置係為一時間控制器，該電子系統 係為一液晶顯不糸統。 7. —種電源啟動重置訊號之產生方法，用以產生一 電源啟動重置訊號，以重置一電子系統之一半導體裝置， 該電子系統係被供以一第一電源電壓與一第二電源電 壓，該第一電源電壓係為該半導體裝置之電源電壓，該第 二電源電壓係較該第一電源電壓早產生，該方法包括： • 依據該第二電源電壓產生一固定參考電壓； 依據該第一電源電壓產生一比例輸入電壓； 比較該比例輸入電壓與該固定參考電壓，以於該比例 輸入電壓超越該固定參考電壓時，產生該電源啟動重置訊 號。 8. 如申請專利範圍第7項所述之電源啟動重置訊號 之產生方法，其中，當該比例輸入電壓超越該固定參考電 壓時，產生高位準之該電源啟動重置訊號。 • 9/如申請專利範圍第7項所述之電源啟動重置訊號 之產生方法，其中，當該比例輸入電壓未超越該固定參考 電壓時，產生低位準之該電源啟動重置訊號。 10. 如申請專利範圍第7項所述之電源啟動重置訊號 . - -.. . . - . Γ 之產生方法，其中，當該第二電源電壓係大於該第一電源 電壓時，該半導體裝置被重置。 11. 一種電源啟動重置電路，包括： 一分壓電路，係被供以一第一電源電壓，以產生一比 200830712TW3111PA # 例輸入電壓； 月^隙苓考電路，係被供以一第二電源電壓， 一固定蒼考電愚，甘士备 產生 斤 其中在該第一電源電壓開始產生之此 ，壓6經完鱗備；以及 ’ 一比較器，比較該比例輸入電壓與該固 當該比例輪人電壓超越該蚊參考電壓時生考=， 動重置訊號。 產生一電源啟 」2·如中請專利範圍第u項所述之電源啟動 ，卜㈣L: 輪人電壓超越該蚊參考電麗時，該 又™生向位準之該電源啟動重置訊號。 δχ 如中請專利範圍第u項所述之電源啟動+ 入電壓未超越該固定參考電壓二 該t #又。'產生低位準之該電源啟動重置訊號。 14·如申請專利範圍第u項所述之電源啟動重置電 路’其中’該比較器係被供以該第二電源電壓。 龜 15·如申請專利範圍第11項所述之電源啟動重置電 2，其中，該電源啟動重置電路係用於一電子系統之一半 v體裝置，當該第二電源電壓係高於該第一電源電壓時， 該半導體裝置被重置。 16·如申請專利範圍第15項所述之電源啟動重置電 路、，其中，該半導體裝置係為一時間控制器，該電子系統 係為一液晶顯示系統。200830712 TW3111PA ^ X. Patent Application Range: 1. A power-on reset circuit for a semiconductor device of an electronic system, the electronic system being supplied with a first power voltage and a second power voltage, the first The power supply voltage is the power supply voltage of the semiconductor device, and the second power supply voltage is generated earlier than the first power supply voltage, and includes: a voltage dividing circuit that is supplied with the first power supply voltage to generate a proportional input voltage An energy gap circuit is supplied with the second power voltage to generate a fixed reference voltage; a comparator for comparing the proportional input voltage with the fixed reference voltage to exceed the ratio of the input voltage When the reference voltage is fixed, a power is generated to initiate the reset signal. 2. The power-on reset circuit of claim 1, wherein when the comparison input voltage exceeds the fixed reference voltage, the comparator generates a high level of the power-on reset signal. 3. The power-on reset circuit of claim 1, wherein when the comparison input voltage does not exceed the fixed reference voltage, the comparator generates a low level of the power-on reset signal. 4. The power-on reset circuit of claim 1, wherein the comparator is supplied with the second power voltage. 1. The power-on reset circuit of claim 1, wherein the semiconductor device is heavily weighted when the second power voltage is higher than the first power voltage Set. The invention relates to a power-on reset circuit as described in claim 1, wherein the semiconductor device is a time controller, and the electronic system is a liquid crystal display system. 7. A method for generating a power-on reset signal for generating a power-on reset signal for resetting a semiconductor device of an electronic system, the electronic system being supplied with a first power supply voltage and a second a power supply voltage, the first power voltage is a power voltage of the semiconductor device, and the second power voltage is generated earlier than the first power voltage, the method comprising: • generating a fixed reference voltage according to the second power voltage; The first supply voltage generates a proportional input voltage; comparing the proportional input voltage with the fixed reference voltage to generate the power-on reset signal when the proportional input voltage exceeds the fixed reference voltage. 8. The method of generating a power-on reset signal according to claim 7, wherein when the proportional input voltage exceeds the fixed reference voltage, the power source generates a high-level reset signal. • 9/ The method of generating a power-on reset signal as described in claim 7 wherein the power-on reset signal is generated when the proportional input voltage does not exceed the fixed reference voltage. 10. The method of generating a power-on reset signal according to claim 7 of the patent application scope, wherein the second power source voltage is greater than the first power source voltage, the semiconductor The device is reset. 11. A power-on reset circuit comprising: a voltage divider circuit that is supplied with a first supply voltage to generate a ratio of 200830712TW3111PA #例 input voltage; a monthly reference circuit is provided The second power supply voltage, a fixed Cang test electric fool, Ganshi prepared to produce the pound, which is generated at the beginning of the first power supply voltage, the pressure 6 is completed; and a comparator compares the proportional input voltage with the solid ratio When the voltage of the wheel exceeds the reference voltage of the mosquito, the test is activated, and the signal is reset. A power supply is generated. 2) If the power supply is started according to the scope of the patent range, (4) L: When the voltage of the wheel exceeds the reference voltage of the mosquito, the power generation of the TM is activated to activate the reset signal. Δχ The power supply starting + input voltage as described in item u of the patent scope does not exceed the fixed reference voltage two. 'The low power level generates the power to initiate the reset signal. 14. A power-on reset circuit as described in claim 5, wherein the comparator is supplied with the second supply voltage. Turtle 15. The power-on reset circuit 2 of claim 11, wherein the power-on reset circuit is used for one half-v body device of an electronic system, when the second power voltage system is higher than the At the first supply voltage, the semiconductor device is reset. The power-on reset circuit of claim 15, wherein the semiconductor device is a time controller, and the electronic system is a liquid crystal display system.
TW096128912A 2007-01-03 2007-08-06 Power-on-reset circuit and method therefor TW200830712A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US11/648,548 US20080158220A1 (en) 2007-01-03 2007-01-03 Power-on-reset circuit and method therefor

Publications (1)

Publication Number Publication Date
TW200830712A true TW200830712A (en) 2008-07-16

Family

ID=39583223

Family Applications (1)

Application Number Title Priority Date Filing Date
TW096128912A TW200830712A (en) 2007-01-03 2007-08-06 Power-on-reset circuit and method therefor

Country Status (3)

Country Link
US (1) US20080158220A1 (en)
CN (1) CN101242137A (en)
TW (1) TW200830712A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI779641B (en) * 2020-07-02 2022-10-01 華邦電子股份有限公司 Power down detection circuit and semiconductor memory device

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20090012479A (en) * 2007-07-30 2009-02-04 삼성전자주식회사 Battery module, computer system having the same and control method thereof
TWI423229B (en) * 2009-04-27 2014-01-11 Himax Tech Ltd Power detecting device, power supply device using the same and reference voltage generator
US9515648B2 (en) * 2010-03-26 2016-12-06 Sandisk Technologies Llc Apparatus and method for host power-on reset control
US9239612B2 (en) * 2010-08-25 2016-01-19 Renesas Electronics Corporation First power-on reset circuit with higher power consumption than a second power-on reset circuit
CN105096857B (en) 2015-07-24 2018-03-27 深圳市华星光电技术有限公司 A kind of gate driving circuit and liquid crystal display
CN109802565B (en) * 2017-11-16 2020-06-05 立锜科技股份有限公司 Switching power supply and control circuit thereof
JP6886545B1 (en) * 2020-05-07 2021-06-16 ウィンボンド エレクトロニクス コーポレーション Power-down detection circuit and semiconductor storage device
TWI726808B (en) * 2020-09-04 2021-05-01 新唐科技股份有限公司 Under voltage lock out circuit and operating method thereof

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6342802B1 (en) * 1999-10-28 2002-01-29 Seagate Technology Llc Multi-voltage power-up stable input/output buffer circuit in a disc drive
KR100891122B1 (en) * 2002-12-23 2009-04-06 엘지디스플레이 주식회사 Circuit for timing-Controller reset
US7208987B2 (en) * 2003-12-18 2007-04-24 Stmicroelectronics, Inc. Reset initialization
US7368960B2 (en) * 2005-06-15 2008-05-06 Cypress Semiconductor Corp. Circuit and method for monitoring the integrity of a power supply

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI779641B (en) * 2020-07-02 2022-10-01 華邦電子股份有限公司 Power down detection circuit and semiconductor memory device

Also Published As

Publication number Publication date
CN101242137A (en) 2008-08-13
US20080158220A1 (en) 2008-07-03

Similar Documents

Publication Publication Date Title
TW200830712A (en) Power-on-reset circuit and method therefor
TWI479784B (en) Ac/dc converting circuit
TWI643054B (en) A system and method are provided for generating non-overlapping enable signals
TWI440288B (en) Startup control circuit with acceleration startup function and method for operating the same
JP2010075044A (en) Integrated circuit, power supply control circuit, method, and power supply
TW201117164A (en) Low power display control method and associated display controller
TWI459175B (en) Tracking boost apparauts and mothod for a power factor correction circuit
TWI352475B (en) Device and method for surge prevention
JP2019050717A (en) Signal based ignition with inductive flyback power
TW201314431A (en) Power supply control system and method
TW201218605A (en) AC/DC converter, AC/DC conversion method, and controller for controlling voltage conversion
US11368094B2 (en) Control system and power supply unit
US7368895B2 (en) Apparatus for a power supply with brownout protection and the protecting method for the same
US20080001554A1 (en) Limited current circuit of digital inverter for LCD backlight
TW200413879A (en) Regulator and related control method for preventing exceeding initial current by compensation current of additional current mirror
US9197054B2 (en) Circuit for controlling a latch mode of a pulse width modulation circuit and method thereof
TW200413894A (en) Regulator and related method capable of performing pre-charging
TW202112027A (en) Temperature dependent current and pulse controlled charging method for a battery charger
TWI756936B (en) Power supply circuit
US10516347B1 (en) Load detection method and apparatus
KR101069960B1 (en) Initial driving circuit of backlight unit
TW201018037A (en) Power supply to maintain synchronous multiple outputs
TW200538909A (en) System and method for adjusting CPU supply voltage
JP2002288990A (en) Peak hold circuit
TWI224684B (en) Alternating-current electronic load simulator applicable for arbitrary alternating-current signal waveform